Physical Addresses, Logical Addresses, and Logical Names
When communicating on today’s modern networks, there are three levels of addressing:
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Physical addresses (MAC addresses)
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Logical addresses (IP addresses)
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Logical names (domain names and hostnames)
Because many network devices share the same transmission channel, each node on the network must have some way to identify itself from the other nodes. The physical device address or media access control (MAC) address is a unique hardware address (unique on the LAN) burned onto a ROM chip assigned by the hardware vendors.
The MAC address is 48 bits (6 bytes) in length and is usually represented in hexadecimal format. The first 24 bits of a MAC address are referred to as the organizationally ...
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